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-rw-r--r--roots.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/roots.c b/roots.c
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index 000000000..6a6cf8adc
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+++ b/roots.c
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+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "mtdutils/mtdutils.h"
+#include "mtdutils/mounts.h"
+#include "minzip/Zip.h"
+#include "roots.h"
+#include "common.h"
+
+typedef struct {
+ const char *name;
+ const char *device;
+ const char *device2; // If the first one doesn't work (may be NULL)
+ const char *partition_name;
+ const char *mount_point;
+ const char *filesystem;
+} RootInfo;
+
+/* Canonical pointers.
+xxx may just want to use enums
+ */
+static const char g_mtd_device[] = "@\0g_mtd_device";
+static const char g_raw[] = "@\0g_raw";
+static const char g_package_file[] = "@\0g_package_file";
+
+static RootInfo g_roots[] = {
+ { "BOOT:", g_mtd_device, NULL, "boot", NULL, g_raw },
+ { "CACHE:", g_mtd_device, NULL, "cache", "/cache", "yaffs2" },
+ { "DATA:", g_mtd_device, NULL, "userdata", "/data", "yaffs2" },
+ { "MISC:", g_mtd_device, NULL, "misc", NULL, g_raw },
+ { "PACKAGE:", NULL, NULL, NULL, NULL, g_package_file },
+ { "RECOVERY:", g_mtd_device, NULL, "recovery", "/", g_raw },
+ { "SDCARD:", "/dev/block/mmcblk0p1", "/dev/block/mmcblk0", NULL, "/sdcard", "vfat" },
+ { "SYSTEM:", g_mtd_device, NULL, "system", "/system", "yaffs2" },
+ { "TMP:", NULL, NULL, NULL, "/tmp", NULL },
+};
+#define NUM_ROOTS (sizeof(g_roots) / sizeof(g_roots[0]))
+
+// TODO: for SDCARD:, try /dev/block/mmcblk0 if mmcblk0p1 fails
+
+static const RootInfo *
+get_root_info_for_path(const char *root_path)
+{
+ const char *c;
+
+ /* Find the first colon.
+ */
+ c = root_path;
+ while (*c != '\0' && *c != ':') {
+ c++;
+ }
+ if (*c == '\0') {
+ return NULL;
+ }
+ size_t len = c - root_path + 1;
+ size_t i;
+ for (i = 0; i < NUM_ROOTS; i++) {
+ RootInfo *info = &g_roots[i];
+ if (strncmp(info->name, root_path, len) == 0) {
+ return info;
+ }
+ }
+ return NULL;
+}
+
+static const ZipArchive *g_package = NULL;
+static char *g_package_path = NULL;
+
+int
+register_package_root(const ZipArchive *package, const char *package_path)
+{
+ if (package != NULL) {
+ package_path = strdup(package_path);
+ if (package_path == NULL) {
+ return -1;
+ }
+ g_package_path = (char *)package_path;
+ } else {
+ free(g_package_path);
+ g_package_path = NULL;
+ }
+ g_package = package;
+ return 0;
+}
+
+int
+is_package_root_path(const char *root_path)
+{
+ const RootInfo *info = get_root_info_for_path(root_path);
+ return info != NULL && info->filesystem == g_package_file;
+}
+
+const char *
+translate_package_root_path(const char *root_path,
+ char *out_buf, size_t out_buf_len, const ZipArchive **out_package)
+{
+ const RootInfo *info = get_root_info_for_path(root_path);
+ if (info == NULL || info->filesystem != g_package_file) {
+ return NULL;
+ }
+
+ /* Strip the package root off of the path.
+ */
+ size_t root_len = strlen(info->name);
+ root_path += root_len;
+ size_t root_path_len = strlen(root_path);
+
+ if (out_buf_len < root_path_len + 1) {
+ return NULL;
+ }
+ strcpy(out_buf, root_path);
+ *out_package = g_package;
+ return out_buf;
+}
+
+/* Takes a string like "SYSTEM:lib" and turns it into a string
+ * like "/system/lib". The translated path is put in out_buf,
+ * and out_buf is returned if the translation succeeded.
+ */
+const char *
+translate_root_path(const char *root_path, char *out_buf, size_t out_buf_len)
+{
+ if (out_buf_len < 1) {
+ return NULL;
+ }
+
+ const RootInfo *info = get_root_info_for_path(root_path);
+ if (info == NULL || info->mount_point == NULL) {
+ return NULL;
+ }
+
+ /* Find the relative part of the non-root part of the path.
+ */
+ root_path += strlen(info->name); // strip off the "root:"
+ while (*root_path != '\0' && *root_path == '/') {
+ root_path++;
+ }
+
+ size_t mp_len = strlen(info->mount_point);
+ size_t rp_len = strlen(root_path);
+ if (mp_len + 1 + rp_len + 1 > out_buf_len) {
+ return NULL;
+ }
+
+ /* Glue the mount point to the relative part of the path.
+ */
+ memcpy(out_buf, info->mount_point, mp_len);
+ if (out_buf[mp_len - 1] != '/') out_buf[mp_len++] = '/';
+
+ memcpy(out_buf + mp_len, root_path, rp_len);
+ out_buf[mp_len + rp_len] = '\0';
+
+ return out_buf;
+}
+
+static int
+internal_root_mounted(const RootInfo *info)
+{
+ if (info->mount_point == NULL) {
+ return -1;
+ }
+//xxx if TMP: (or similar) just say "yes"
+
+ /* See if this root is already mounted.
+ */
+ int ret = scan_mounted_volumes();
+ if (ret < 0) {
+ return ret;
+ }
+ const MountedVolume *volume;
+ volume = find_mounted_volume_by_mount_point(info->mount_point);
+ if (volume != NULL) {
+ /* It's already mounted.
+ */
+ return 0;
+ }
+ return -1;
+}
+
+int
+is_root_path_mounted(const char *root_path)
+{
+ const RootInfo *info = get_root_info_for_path(root_path);
+ if (info == NULL) {
+ return -1;
+ }
+ return internal_root_mounted(info) >= 0;
+}
+
+int
+ensure_root_path_mounted(const char *root_path)
+{
+ const RootInfo *info = get_root_info_for_path(root_path);
+ if (info == NULL) {
+ return -1;
+ }
+
+ int ret = internal_root_mounted(info);
+ if (ret >= 0) {
+ /* It's already mounted.
+ */
+ return 0;
+ }
+
+ /* It's not mounted.
+ */
+ if (info->device == g_mtd_device) {
+ if (info->partition_name == NULL) {
+ return -1;
+ }
+//TODO: make the mtd stuff scan once when it needs to
+ mtd_scan_partitions();
+ const MtdPartition *partition;
+ partition = mtd_find_partition_by_name(info->partition_name);
+ if (partition == NULL) {
+ return -1;
+ }
+ return mtd_mount_partition(partition, info->mount_point,
+ info->filesystem, 0);
+ }
+
+ if (info->device == NULL || info->mount_point == NULL ||
+ info->filesystem == NULL ||
+ info->filesystem == g_raw ||
+ info->filesystem == g_package_file) {
+ return -1;
+ }
+
+ mkdir(info->mount_point, 0755); // in case it doesn't already exist
+ if (mount(info->device, info->mount_point, info->filesystem,
+ MS_NOATIME | MS_NODEV | MS_NODIRATIME, "")) {
+ if (info->device2 == NULL) {
+ LOGE("Can't mount %s\n(%s)\n", info->device, strerror(errno));
+ return -1;
+ } else if (mount(info->device2, info->mount_point, info->filesystem,
+ MS_NOATIME | MS_NODEV | MS_NODIRATIME, "")) {
+ LOGE("Can't mount %s (or %s)\n(%s)\n",
+ info->device, info->device2, strerror(errno));
+ return -1;
+ }
+ }
+ return 0;
+}
+
+int
+ensure_root_path_unmounted(const char *root_path)
+{
+ const RootInfo *info = get_root_info_for_path(root_path);
+ if (info == NULL) {
+ return -1;
+ }
+ if (info->mount_point == NULL) {
+ /* This root can't be mounted, so by definition it isn't.
+ */
+ return 0;
+ }
+//xxx if TMP: (or similar) just return error
+
+ /* See if this root is already mounted.
+ */
+ int ret = scan_mounted_volumes();
+ if (ret < 0) {
+ return ret;
+ }
+ const MountedVolume *volume;
+ volume = find_mounted_volume_by_mount_point(info->mount_point);
+ if (volume == NULL) {
+ /* It's not mounted.
+ */
+ return 0;
+ }
+
+ return unmount_mounted_volume(volume);
+}
+
+const MtdPartition *
+get_root_mtd_partition(const char *root_path)
+{
+ const RootInfo *info = get_root_info_for_path(root_path);
+ if (info == NULL || info->device != g_mtd_device ||
+ info->partition_name == NULL)
+ {
+ return NULL;
+ }
+ mtd_scan_partitions();
+ return mtd_find_partition_by_name(info->partition_name);
+}
+
+int
+format_root_device(const char *root)
+{
+ /* Be a little safer here; require that "root" is just
+ * a device with no relative path after it.
+ */
+ const char *c = root;
+ while (*c != '\0' && *c != ':') {
+ c++;
+ }
+ if (c[0] != ':' || c[1] != '\0') {
+ LOGW("format_root_device: bad root name \"%s\"\n", root);
+ return -1;
+ }
+
+ const RootInfo *info = get_root_info_for_path(root);
+ if (info == NULL || info->device == NULL) {
+ LOGW("format_root_device: can't resolve \"%s\"\n", root);
+ return -1;
+ }
+ if (info->mount_point != NULL) {
+ /* Don't try to format a mounted device.
+ */
+ int ret = ensure_root_path_unmounted(root);
+ if (ret < 0) {
+ LOGW("format_root_device: can't unmount \"%s\"\n", root);
+ return ret;
+ }
+ }
+
+ /* Format the device.
+ */
+ if (info->device == g_mtd_device) {
+ mtd_scan_partitions();
+ const MtdPartition *partition;
+ partition = mtd_find_partition_by_name(info->partition_name);
+ if (partition == NULL) {
+ LOGW("format_root_device: can't find mtd partition \"%s\"\n",
+ info->partition_name);
+ return -1;
+ }
+ if (info->filesystem == g_raw || !strcmp(info->filesystem, "yaffs2")) {
+ MtdWriteContext *write = mtd_write_partition(partition);
+ if (write == NULL) {
+ LOGW("format_root_device: can't open \"%s\"\n", root);
+ return -1;
+ } else if (mtd_erase_blocks(write, -1) == (off_t) -1) {
+ LOGW("format_root_device: can't erase \"%s\"\n", root);
+ mtd_write_close(write);
+ return -1;
+ } else if (mtd_write_close(write)) {
+ LOGW("format_root_device: can't close \"%s\"\n", root);
+ return -1;
+ } else {
+ return 0;
+ }
+ }
+ }
+//TODO: handle other device types (sdcard, etc.)
+ LOGW("format_root_device: can't handle non-mtd device \"%s\"\n", root);
+ return -1;
+}